Denial of Service

A Denial of Service (DoS) attack denies legitimate users access to computer services (or resources), usually by overloading the service with requests or by exploiting vulnerabilities, resulting in a degradation of performance, and possibly crashing the service or even the operating system.

Getting ready

SMBLoris is a remote and uncredentialed DoS attack against Microsoft Windows operating systems, caused by a 20+ year old vulnerability in the Server Message Block (SMB) network protocol implementation.

How to do it...

1. Before using the SMBLoris NBSS Denial of Service auxiliary DoS module, we need to use the ulimit command to set the maximum number of open file descriptors to 65535, so we can handle simultaneous connections:

root@kali:~# ulimit -n 65535
root@kali:~# ulimit -n
65535
root@kali:~#

2. Now that we have set the maximum number of simultaneous connections to 65535, we can use the SMBLoris NBSS Denial of Service auxiliary DoS module to attack our target, by simply setting the...